Package com.itextpdf.signatures

Class PrivateKeySignature

java.lang.Object

com.itextpdf.signatures.PrivateKeySignature

All Implemented Interfaces:

IExternalSignature

 public class PrivateKeySignature extends Object implements IExternalSignature 
      

Implementation of the IExternalSignature interface that can be used when you have a PrivateKey object.

Author:

Paulo Soares

Constructor Summary

Constructors

Constructor	Description
PrivateKeySignature(PrivateKey pk, String hashAlgorithm, String provider)	Creates a PrivateKeySignature instance.

Method Summary

Modifier and Type	Method	Description
String	getEncryptionAlgorithm()	Returns the encryption algorithm used for signing.
String	getHashAlgorithm()	Returns the hash algorithm.
byte[]	sign(byte[] message)	Signs the given message using the encryption algorithm in combination with the hash algorithm.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PrivateKeySignature

 public PrivateKeySignature 
             (PrivateKey pk, String hashAlgorithm, String provider) 
            

Creates a PrivateKeySignature instance.

Parameters:

pk - A PrivateKey object.

hashAlgorithm - A hash algorithm (e.g. "SHA-1", "SHA-256",...).

provider - A security provider (e.g. "BC").

Method Details

getHashAlgorithm

 public String getHashAlgorithm() 
            

Returns the hash algorithm.

Specified by:

getHashAlgorithm in interface IExternalSignature

Returns:

The hash algorithm (e.g. "SHA-1", "SHA-256,...").

getEncryptionAlgorithm

 public String getEncryptionAlgorithm() 
            

Returns the encryption algorithm used for signing.

Specified by:

getEncryptionAlgorithm in interface IExternalSignature

Returns:

The encryption algorithm ("RSA" or "DSA").

sign

 public byte[] sign 
             (byte[] message) throws GeneralSecurityException 
            

Signs the given message using the encryption algorithm in combination with the hash algorithm.

Specified by:

sign in interface IExternalSignature

Parameters:

message - The message you want to be hashed and signed.

Returns:

A signed message digest.

Throws:

GeneralSecurityException - when requested cryptographic algorithm or security provider is not available